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ACARINA 
Eriophyidae 
The pear bud mite 
Six large trees in a Cornice pear orchard heavily infested with 
pear bud mites were sprayed with a mixture of 5 pounds of AK-20 (20 
percent DDT) and 4 ounces of sodium oleyl sulfate in 100 gallons of 
water. A population count made a week later showed no apparent kill 
of the mites*— Borden and Jeppson (92). 
Ixodida® 
Derroaoentor and ersonl Stiles, spotted-fever tick 
In preliminary tests DDT was of little value in controlling this 
speoies of tiok. A yearling beef sprayed along -ttie back with Gesarol A 
spray 50 pounds (DDT 2.5 pounds) per 100 gallons of water did not appear 
to be resistant to ticks plaoed on the animal 1 week later* Similar 
results were obtained on rabbits infested 3 days after treatment with 
Gesarol A dust, or a spray of Heooid No. 15.— Ross (306 ) • 
Ornithodoros nicolloi Mooser 
Ornithodoros turlcata (Duges) 
A low percentage of DDT on filter paper killed adults within 2 weeks* 
By the eighth day they were unable to bite a guinea pig.— Vargas and 
Colorado Iris (560 ). 
Khipicephalus sanguineus (Latr.), the brown dog tick 
DDT is superior to anything yet found for the oontrol of the brown 
dog tick*— Anon. (15 ). 
A looal veterinarian reported that all tioks dusted with TDDT died 
within 48 hours, whereas ticks which dropped from tine dog when treated 
with a pyrethrum dip recovered and lived as long as 42 days.— Cartwright 
(108). 
This tiok proved difficult to control with Neooid A-5 and A-10. 
Approximately 50 peroent of these tioks on the dogs and about the premi- 
ses of the dog owners were destroyed.— Parker (287 ) • 
Sarooptidae 
Khefflidokopt e s gallinae (Raill.), the depluming mite 
Chickens badly infested wiiii this mite and the hen house were dust- 
ed with a 5-percent DDT dust. After 2 weeks the treated ohickens were 
